Creating a Video for DVD
The two standards for DVDs are NSTC or PAL. Both are a rather low quality format by today's HD standards. You said that you are coming from old media, so going to DVD there will be no loss in quality.

Blender makes it quite easy with presets. Here I'm assuming NSTC.
Everything you need to set is in the Render tab of the properties window.
There is a preset for the dimensions: TV NTSC. The preset for the output is split among two headings Output and Encoding. Choose MPEG for the file type, and make sure it is set to RGB. Then the default DVD preset for the encoding works well.